In 1995, when Bill Gates was 19 years old he envisioned in his book, The Road Ahead, a wallet PC that would be as handy as a Swiss Army knife. Yup, pretty much an iPhone or smartphone.
He describes, “it will be about the same size as a wallet, which means you’ll be able to carry it in your pocket or purse. It will display messages and schedules and let you read or send electronic mail and faxes, monitor weather and stock reports, and play both simple and sophisticated games. At a meeting, you might take notes, check your appointments, browse information if you’re bored, or choose from among thousands of easy-to-call-up photos of your kids.”
Check out the article from Brain Pickings: The New Swiss Army Knife: Bill Gates Predicts the iPhone in 1995
But hey, how about a prediction in 1968 of something like an iPad! Also from Brain Pickings is this article about how the science fiction writer, inventor, and futurist Arthur C. Clarke described the “newspad” in his novel, 2001 A Space Odyssey: